Preheat the oven to 160°C fan bake and line two baking trays with baking paper.

Place butter and the sugars into a bowl and beat until creamy, then beat in the vanilla extract and egg. Sieve the flour, baking soda and salt over the mixture and mix in with a wooden spoon. Add the chocolate chips and stir well.

Using a teaspoon, place walnut sized mounds of mixture well apart on the baking trays. Bake in the oven for 10-15 minutes until light brown on the edges and still slightly soft in the centre.

Leave on the tray for a couple of minutes to firm up and then transfer to a cooling rack.

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Tip: Double the recipe, bake then freeze half the batch for another time.